US4664706A - Sintered shrink-on cam and process of manufacturing such cam - Google Patents

Sintered shrink-on cam and process of manufacturing such cam Download PDF

Info

Publication number
US4664706A
US4664706A US06/850,038 US85003886A US4664706A US 4664706 A US4664706 A US 4664706A US 85003886 A US85003886 A US 85003886A US 4664706 A US4664706 A US 4664706A
Authority
US
United States
Prior art keywords
molybdenum
tungsten
weight percent
atomic weight
content
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US06/850,038
Inventor
Manfred Drozda
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Miba Sintermetall GmbH
Original Assignee
Miba Sintermetall GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Miba Sintermetall GmbH filed Critical Miba Sintermetall GmbH
Assigned to MIBA SINTERMETALL AKTIENGESELLSCHAFT reassignment MIBA SINTERMETALL AKTIENGESELLSCHAFT ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: DROZDA, MANFRED
Application granted granted Critical
Publication of US4664706A publication Critical patent/US4664706A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/02—Making ferrous alloys by powder metallurgy
    • C22C33/0257—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements
    • C22C33/0264—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements the maximum content of each alloying element not exceeding 5%
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H53/00—Cams ; Non-rotary cams; or cam-followers, e.g. rollers for gearing mechanisms
    • F16H53/02—Single-track cams for single-revolution cycles; Camshafts with such cams
    • F16H53/025—Single-track cams for single-revolution cycles; Camshafts with such cams characterised by their construction, e.g. assembling or manufacturing features
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/24—After-treatment of workpieces or articles
    • B22F2003/248—Thermal after-treatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
    • B22F2998/10—Processes characterised by the sequence of their steps
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/21—Elements
    • Y10T74/2101—Cams

Definitions

  • This invention relates to a cam to be shrunk on a camshaft and to a process for sintering such cam.
  • cams of a camshaft are made as separate components and shrunk on a preferably tubular shaft will afford considerable advantages as regards the manufacture and the weight of the camshaft.
  • the cams must be made in a relatively simple manner and with the required precision from a material which will withstand the loads to be encountered.
  • Cams made as separate parts may be made by a sintering process. But it is difficult to provide sintered cams which have the required strength and the required precision.
  • the porosity of the sintered member must be low and the alloying elements added to the steel must be distributed as homogeneously as possible.
  • Another object of the invention is to provide a simple process of sintering such cams.
  • the cam consists of an nickel- and copper-free, sintered powder mixture which comprises iron powder and contains 0.3 to 1.0 weight percent carbon and molybdenum and/or tungsten in such amounts that the sum of the molybdenum content and the tungsten content multiplied with the ratio of the atomic weight of molybdenum to the atomic weight of tungsten lies between 0.5 and 3 weight percent.
  • a sintered material having that specific composition will have excellent hardenability, excellent tempering properties and an excellent impact strength. That alloy has a much higher resistance to Hertzian compressive stress than comparable chromium alloy steels or carbonitrided sintered materials.
  • Molybdenum may be replaced by tungsten, which in comparison to the molybdenum results in certain advantages regarding the tempering properties of the cams. But tungsten must replace the molybdenum in an amount which is larger in accordance with the ratio of the atomic weights of said elements. This means that molybdenum must be replaced by approximately twice the quantity of tungsten.
  • the strength properties depend, inter alia, on the homogeneity with which the molybdenum can be distributed.
  • the nickel- and copper-free mixture which comprises iron powder and contains 0.3 to 1 weight percent carbon and at least one alloying element selected from the group consisting of molybdenum and tungsten in such amounts that the sum of the molybdenum content and the tungsten content multiplied with the ratio of the atomic weight of molybdenum to the atomic weight of tungsten lies between 0.5 and 3.0 weight percent is compacted to form a compact having an apparent specific gravity of at least 7.2 g/cm 3 and the compact is sintered at a temperature which is higher than the eutectic point of the mixture of iron and intermediate molybdenum carbide and/or tungsten carbide and below the solidus point of the adjacent ternary or quaternary system when said system is in the state of equilibrium.
  • the liquid phase consisting of iron and molybdenum carbide and/or tungsten carbide is very quickly incorporated in the structure as a solid solution and with an almost homogeneous distribution of molybdenum and/or tungsten.
  • the desired dimensional stability can readily be ensured in conjunction with a relatively low porosity. Owing to the absence of a phase which is liquid throughout the sintering operation, there is hardly a shrinkage and the void ratio will depend only on the density to which the powder is compacted and which should be at least 7.2 g/cm 3 .
  • the mixture contains iron powder, 0.7 to 0.9 weight percent carbon and molybdenum and/or tungsten in such amounts that the sum of the molybdenum content and the tungsten content multiplied with the ratio of the atomic weight of molybdenum to the atomic weight of tungsten lies between 1 to 1.5 weight percent.
  • a sintered material can be heat-treated to have a Rockwell hardness number in excess of HRC 40 and a fatigue strength in excess of 400 MPa under rotating bending loads.
  • the heat treatment is carried out under such conditions that the hardness of the cams will not be decreased by the heating effected to shrink the cams on the camshaft and by the operating conditions of the camshaft.
  • Cams were made from a metal powder mixture which contained 1.5 weight percent molybdenum, 0.7 weight percent graphite, 0.5 weight percent of a conventional compacting aids, balance iron. Under a pressure of 1000 MPa that powder mixture was compacted to form molded compacts having a green density of 7.35 g/cm 3 . The molded compacts were sintered in a sintering furnace at a sintering temperature of 1250° C. for 1.5 hours.
  • Example 2 The metal powder mixture used in Example 2 was similar to that used in Example 1 but molybdenum was replaced by tungsten in an amount which is larger by a factor that is equal to the ratio of the atomic weight of tungsten to the atomic weight of molybdenum. This means that the metal powder mixture contained 3 weight percent tungsten rather than 1.5 weight percent molybdenum.
  • the mixture was again compacted under a pressure of 1000 MPa to form molded compacts having a green density of 7.40 g/cm 3 . Said compacts were sintered at a sintering temperature of 1260° C. for a sintering time of 3 hours.
  • Example 1 and 2 The cams made in Example 1 and 2 were shrunk on a shaft and were then tested in a camshaft test stand and in an operating engine for up to 1500 hours. Excellent wear patterns were obtained in said tests.
  • the trial runs involved cyclic loads between 50 and 700 MPa at frequencies of 6 to 50 Hz.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Powder Metallurgy (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Gears, Cams (AREA)

Abstract

Cams which meet all strength requirements and can be shrunk on a shaft can be made in a simple manner by sintering from a nickel- and copper-free mixture which comprises iron powder and contains 0.3 to 1.0 weight percent carbon and molybdenum and/or tungsten in such amounts that the sum of the molybdenums content and the tungsten content multiplied with the ratio of the atomic weight of molybdenum to the atomic weight of tungsten lies between 0.5 and 3 weight percent.

Description

BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a cam to be shrunk on a camshaft and to a process for sintering such cam.
2. Description of the Prior Art
A practice in which cams of a camshaft are made as separate components and shrunk on a preferably tubular shaft will afford considerable advantages as regards the manufacture and the weight of the camshaft. For such a manufacture of the camshaft the cams must be made in a relatively simple manner and with the required precision from a material which will withstand the loads to be encountered. Cams made as separate parts may be made by a sintering process. But it is difficult to provide sintered cams which have the required strength and the required precision. To provide a material having the required strength, the porosity of the sintered member must be low and the alloying elements added to the steel must be distributed as homogeneously as possible. Said requirements can be met by a liquid-phase sintering process because the sintering in the liquid phase ensures a high diffusion rate and a quick coagulation at the pores. But the resulting high-density sintering involves a substantial shrinkage so that the sintered members may not have the required dimensional stability. For this reason, shrink-on cams cannot be made by a liquid-phase sintering process in which a liquid phase is permanently maintained. Besides, known high-strength sintered steels, which contain, e.g., 4.5 weight percent nickel, 1.5 weight percent copper, 0.5 weight percent molybdenum and 0.4 to 0.7 weight percent carbon, do not meet the strength requirements for cams and exhibit bad tempering properties. Tests have shown that cams made of such sintered steels when subjected to the load reversals to be expected have a useful life of less than 150 hours, which is entirely unsatisfactory.
SUMMARY OF THE INVENTION
It is an object of the invention to avoid said disadvantages and to provide shrink-on cams made of a sintered material which meets all requirements regarding strength and temperature resistance.
Another object of the invention is to provide a simple process of sintering such cams.
The first object mentioned above is accomplished in accordance with the invention in that the cam consists of an nickel- and copper-free, sintered powder mixture which comprises iron powder and contains 0.3 to 1.0 weight percent carbon and molybdenum and/or tungsten in such amounts that the sum of the molybdenum content and the tungsten content multiplied with the ratio of the atomic weight of molybdenum to the atomic weight of tungsten lies between 0.5 and 3 weight percent.
It has surprisingly been found that a sintered material having that specific composition will have excellent hardenability, excellent tempering properties and an excellent impact strength. That alloy has a much higher resistance to Hertzian compressive stress than comparable chromium alloy steels or carbonitrided sintered materials. Molybdenum may be replaced by tungsten, which in comparison to the molybdenum results in certain advantages regarding the tempering properties of the cams. But tungsten must replace the molybdenum in an amount which is larger in accordance with the ratio of the atomic weights of said elements. This means that molybdenum must be replaced by approximately twice the quantity of tungsten.
The strength properties depend, inter alia, on the homogeneity with which the molybdenum can be distributed. To permit a suitable sintered material to be made in a simple manner, the nickel- and copper-free mixture which comprises iron powder and contains 0.3 to 1 weight percent carbon and at least one alloying element selected from the group consisting of molybdenum and tungsten in such amounts that the sum of the molybdenum content and the tungsten content multiplied with the ratio of the atomic weight of molybdenum to the atomic weight of tungsten lies between 0.5 and 3.0 weight percent is compacted to form a compact having an apparent specific gravity of at least 7.2 g/cm3 and the compact is sintered at a temperature which is higher than the eutectic point of the mixture of iron and intermediate molybdenum carbide and/or tungsten carbide and below the solidus point of the adjacent ternary or quaternary system when said system is in the state of equilibrium.
The use of that sintering temperature, which in most cases will lie between 1230° and 1280° C., will ensure that the intermediate molybdenum carbide and/or tungsten carbide formed at all temperatures in question will form with iron a liquid phase, which is required for a rapid homogeneous distribution of molybdenum and/or tungsten. But as the sintering temperature lies below the solidus point of the ternary or quaternary system consisting of gamma iron with dissolved carbon, molybdenum and/or tungsten, when said system is in the state of equilibrium, the liquid phase which is formed cannot be permanent. The liquid phase consisting of iron and molybdenum carbide and/or tungsten carbide is very quickly incorporated in the structure as a solid solution and with an almost homogeneous distribution of molybdenum and/or tungsten. As a result, the desired dimensional stability can readily be ensured in conjunction with a relatively low porosity. Owing to the absence of a phase which is liquid throughout the sintering operation, there is hardly a shrinkage and the void ratio will depend only on the density to which the powder is compacted and which should be at least 7.2 g/cm3.
Particularly desirable conditions will be obtained if the mixture contains iron powder, 0.7 to 0.9 weight percent carbon and molybdenum and/or tungsten in such amounts that the sum of the molybdenum content and the tungsten content multiplied with the ratio of the atomic weight of molybdenum to the atomic weight of tungsten lies between 1 to 1.5 weight percent. Such a sintered material can be heat-treated to have a Rockwell hardness number in excess of HRC 40 and a fatigue strength in excess of 400 MPa under rotating bending loads. Experience has shown that said properties are required for cams having an adequate strength. The heat treatment is carried out under such conditions that the hardness of the cams will not be decreased by the heating effected to shrink the cams on the camshaft and by the operating conditions of the camshaft.
EXAMPLE 1
Cams were made from a metal powder mixture which contained 1.5 weight percent molybdenum, 0.7 weight percent graphite, 0.5 weight percent of a conventional compacting aids, balance iron. Under a pressure of 1000 MPa that powder mixture was compacted to form molded compacts having a green density of 7.35 g/cm3. The molded compacts were sintered in a sintering furnace at a sintering temperature of 1250° C. for 1.5 hours.
When the cams had been cooled to room temperature they were subsequently held at a temperature of 880° C. for 0.5 hours and were then hardened in oil to a Rockwell hardness number of HRC 55. To temper the cams, they were heated at 300° C. for 0.5 hours. A Rockwell hardness number HRC 40 was measured after the tempering.
EXAMPLE 2
The metal powder mixture used in Example 2 was similar to that used in Example 1 but molybdenum was replaced by tungsten in an amount which is larger by a factor that is equal to the ratio of the atomic weight of tungsten to the atomic weight of molybdenum. This means that the metal powder mixture contained 3 weight percent tungsten rather than 1.5 weight percent molybdenum. The mixture was again compacted under a pressure of 1000 MPa to form molded compacts having a green density of 7.40 g/cm3. Said compacts were sintered at a sintering temperature of 1260° C. for a sintering time of 3 hours. When the sintering compacts had been hardened in oil for 0.5 hours at a temperature of 880° C., a Rockwell hardness number of HRC 58 was measured. When the cams had been tempered at 300° C. for 0.5 hours, they had a hardness of HRC 47.
The cams made in Example 1 and 2 were shrunk on a shaft and were then tested in a camshaft test stand and in an operating engine for up to 1500 hours. Excellent wear patterns were obtained in said tests. In dependence on the kind of engine and the test programm, the trial runs involved cyclic loads between 50 and 700 MPa at frequencies of 6 to 50 Hz.

Claims (4)

The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:
1. In a sintered shrink-on cam,
the improvement residing in that
the cam consists of a sintered powder compact which is free of nickel and copper and contains iron, 0.3 to 1.0 weight percent carbon, and at least one alloying element selected from the group consisting of molybdenum and tungsten in such amounts that the sum of the molybdenum content and the tungsten content multiplied with the ratio of the atomic weight of molybdenum to the atomic weight of tungsten lies between 0.5 and 3 weight percent.
2. The improvement set forth in claim 1, wherein said compact contains at least one alloying element selected from the group consisting of molybdenum and tungsten in such amounts that the sum of the molybdenum content and the tungsten content multiplied with the ratio of the atomic weight of molybdenum to the atomic weight of tungsten lies between 1 to 1.5 weight percent.
3. In a process of manufacturing a sintered shrink-on cam by compacting a powder mixture which comprises iron and at least 0.3 weight percent carbon to form powder compacts and sintering said powder compacts,
the improvement residing in that
a powder mixture is provided which is free of nickel and copper and comprises iron and contains 0.3 to 1.0 weight percent carbon and at least one alloying element selected from the group consisting of molybdenum and tungsten in such amounts that the sum of the molybdenum content and the tungsten content multiplied with the ratio of the atomic weight of molybdenum to the atomic weight of tungsten lies between 0.5 and 3 weight percent,
said powder mixture is compacted to form powder compacts having an apparent specific gravity of at least 7.2 g/cm3,
said compacts are heated to form temporarily a eutectic mixute including iron and at least one intermediate compound of the group consisting of molybdenum carbide and tungsten carbide and is heated above the eutectic point of said eutectic mixture to a sintering temperature which is below the solidus point of an adjacent system which consists of gamma iron with dissolved carbon and at least one alloying element of the group consisting of molybdenum and tungsten when said system is in the state of euilibrium.
4. The improvement set forth in claim 3, wherein said powder mixture contains at least one alloying element selected from the group consisting of molybdenum and tungsten in such amounts that the sum of the molybdenum content and the tungsten content multiplied with the ratio of the atomic weight of molybdenum to the atomic weight of tungsten lies between 1 to 1.5 weight percent.
US06/850,038 1985-04-30 1986-04-10 Sintered shrink-on cam and process of manufacturing such cam Expired - Lifetime US4664706A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT1282/85 1985-04-30
AT0128285A AT382334B (en) 1985-04-30 1985-04-30 CAMS FOR SHRINKING ON A CAMSHAFT AND METHOD FOR PRODUCING SUCH A CAM BY SINTERING

Publications (1)

Publication Number Publication Date
US4664706A true US4664706A (en) 1987-05-12

Family

ID=3510513

Family Applications (1)

Application Number Title Priority Date Filing Date
US06/850,038 Expired - Lifetime US4664706A (en) 1985-04-30 1986-04-10 Sintered shrink-on cam and process of manufacturing such cam

Country Status (7)

Country Link
US (1) US4664706A (en)
EP (1) EP0203908B1 (en)
JP (1) JPS61257453A (en)
AT (1) AT382334B (en)
CA (1) CA1268967A (en)
DE (1) DE3661544D1 (en)
ES (1) ES8800626A1 (en)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4804409A (en) * 1986-07-11 1989-02-14 Kawasaki Steel Corporation Alloy steel powder for powder metallurgy
US4863515A (en) * 1986-12-30 1989-09-05 Uddeholm Tooling Aktiebolag Tool steel
US4909843A (en) * 1986-10-04 1990-03-20 Etablissement Supervis Highly wear-resistant iron-nickel-copper-molybdenum sintered alloy with addition of phosphorous
US5082433A (en) * 1989-12-20 1992-01-21 Etablissement Supervis Method for producing a cam
US5293847A (en) * 1993-02-16 1994-03-15 Hoffman Ronald J Powdered metal camshaft assembly
US5918293A (en) * 1994-05-27 1999-06-29 Hoganas Ab Iron based powder containing Mo, P and C
EP1087111A2 (en) * 1999-09-21 2001-03-28 Toyota Jidosha Kabushiki Kaisha Three-dimensional cam and production method thereof
EP1273769A3 (en) * 2001-07-03 2003-10-15 Nissan Motor Co., Ltd. Cam lobe piece of built-up type camshaft
FR2947879A1 (en) * 2009-07-08 2011-01-14 Peugeot Citroen Automobiles Sa Sintered steel cam for a shaft of an internal combustion engine, comprises reinforcement structures diffused in ferrous material, and nanostructures non-diffused in the ferrous material and acting as a solid lubricant
US20120255170A1 (en) * 2007-05-22 2012-10-11 Thomas Flender Camshaft
CN103899372A (en) * 2012-12-27 2014-07-02 北京有色金属研究总院 Powder metallurgy combined sintered camshaft and manufacturing method thereof

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4236923A (en) * 1978-01-31 1980-12-02 Toyota Jidosha Kogyo Kabushiki Kaisha Method of metallurgically joining a fitting to a shaft
US4595556A (en) * 1984-01-12 1986-06-17 Nippon Piston Ring Co., Ltd. Method for manufacturing camshaft

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH290400A (en) * 1950-04-08 1953-04-30 Daimler Benz Ag Process for the production of machine parts with wear-resistant working surfaces, in particular gear wheels and the like made of powder metal.
IT1052293B (en) * 1974-11-30 1981-06-20 Krebsoege Gmbh Sintermetall PROCEDURE FOR THE PRODUCTION OF HOMOGENEOUS SINTERED STEEL PIECES LINKED TO MANGANESE
JPS5450409A (en) * 1977-09-29 1979-04-20 Sumitomo Electric Ind Ltd Sintered steel of high density and its preparation
JPS5940217B2 (en) * 1978-09-11 1984-09-28 三菱マテリアル株式会社 Fe-based sintered alloy with wear resistance
JPS57188649A (en) * 1981-05-14 1982-11-19 Mitsubishi Metal Corp High strength sintered iron group alloy superior in wear resistance and self-lubricity
GB2116589A (en) * 1982-01-21 1983-09-28 Davy Mckee Making sintered steel bearings
JPS58193304A (en) * 1982-05-08 1983-11-11 Hitachi Powdered Metals Co Ltd Preparation of composite sintered machine parts
JPS5938354A (en) * 1982-08-26 1984-03-02 Toyota Motor Corp Joined cam shaft made of sintered alloy
JPS59200740A (en) * 1983-04-28 1984-11-14 Toyota Motor Corp Sintered and forged parts in which strain by heat treatment is stabilized
JPS6070163A (en) * 1983-09-28 1985-04-20 Nippon Piston Ring Co Ltd Wear resistant sintered alloy member
JPS60165307A (en) * 1984-02-07 1985-08-28 Nippon Piston Ring Co Ltd Preparation of cam shaft

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4236923A (en) * 1978-01-31 1980-12-02 Toyota Jidosha Kogyo Kabushiki Kaisha Method of metallurgically joining a fitting to a shaft
US4236923B1 (en) * 1978-01-31 1989-10-10
US4595556A (en) * 1984-01-12 1986-06-17 Nippon Piston Ring Co., Ltd. Method for manufacturing camshaft

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4804409A (en) * 1986-07-11 1989-02-14 Kawasaki Steel Corporation Alloy steel powder for powder metallurgy
US4909843A (en) * 1986-10-04 1990-03-20 Etablissement Supervis Highly wear-resistant iron-nickel-copper-molybdenum sintered alloy with addition of phosphorous
US4863515A (en) * 1986-12-30 1989-09-05 Uddeholm Tooling Aktiebolag Tool steel
US5082433A (en) * 1989-12-20 1992-01-21 Etablissement Supervis Method for producing a cam
US5293847A (en) * 1993-02-16 1994-03-15 Hoffman Ronald J Powdered metal camshaft assembly
US5918293A (en) * 1994-05-27 1999-06-29 Hoganas Ab Iron based powder containing Mo, P and C
EP1087111A2 (en) * 1999-09-21 2001-03-28 Toyota Jidosha Kabushiki Kaisha Three-dimensional cam and production method thereof
EP1087111A3 (en) * 1999-09-21 2002-10-30 Toyota Jidosha Kabushiki Kaisha Three-dimensional cam and production method thereof
US6517601B1 (en) 1999-09-21 2003-02-11 Toyota Jidosha Kabushiki Kaisha Three-dimensional cam and production method thereof
EP1273769A3 (en) * 2001-07-03 2003-10-15 Nissan Motor Co., Ltd. Cam lobe piece of built-up type camshaft
US20120255170A1 (en) * 2007-05-22 2012-10-11 Thomas Flender Camshaft
US8720055B2 (en) * 2007-05-22 2014-05-13 Mahle International Gmbh Method of assembling a cam shaft that includes a thermal interference fit between the cam shaft and a bearing
FR2947879A1 (en) * 2009-07-08 2011-01-14 Peugeot Citroen Automobiles Sa Sintered steel cam for a shaft of an internal combustion engine, comprises reinforcement structures diffused in ferrous material, and nanostructures non-diffused in the ferrous material and acting as a solid lubricant
CN103899372A (en) * 2012-12-27 2014-07-02 北京有色金属研究总院 Powder metallurgy combined sintered camshaft and manufacturing method thereof
CN103899372B (en) * 2012-12-27 2016-09-07 北京恒源天桥粉末冶金有限公司 A kind of powder metallurgy combined sintering formula camshaft and preparation method thereof

Also Published As

Publication number Publication date
JPS61257453A (en) 1986-11-14
ATA128285A (en) 1986-07-15
EP0203908A1 (en) 1986-12-03
CA1268967A (en) 1990-05-15
AT382334B (en) 1987-02-10
JPH0561347B2 (en) 1993-09-06
ES554597A0 (en) 1987-11-16
DE3661544D1 (en) 1989-02-02
EP0203908B1 (en) 1988-12-28
ES8800626A1 (en) 1987-11-16

Similar Documents

Publication Publication Date Title
EP0331679B1 (en) High density sintered ferrous alloys
US4970049A (en) Sintered materials
EP0480495B1 (en) Sintered ferrous-based material
CA2032300C (en) Molded article, particularly a cam of a sintered alloy, produced by powder metallurgical means and a method for its production
US4664706A (en) Sintered shrink-on cam and process of manufacturing such cam
CA2035378A1 (en) Optimized double press-double sinter powder metallurgy method
US5895517A (en) Sintered Fe alloy for valve seat
US4123265A (en) Method of producing ferrous sintered alloy of improved wear resistance
US5294269A (en) Repeated sintering of tungsten based heavy alloys for improved impact toughness
US6783568B1 (en) Sintered steel material
US5069867A (en) Process of manufacturing high-strength sintered members
US5328500A (en) Method for producing metal powders
Engstrom Evaluation of Sinter Hardening of Different P/M Materials
Bagliuk Properties and structure of sintered boron containing carbon steels
JPH08501832A (en) Method of producing sintered alloy steel components
US4915735A (en) Wear-resistant sintered alloy and method for its production
JPS6117895B2 (en)
Semel Ancorloy premixes: Binder-treated analogs of the diffusion alloyed steels
US4840665A (en) Wear-resistant sintered iron-based alloy and process for producing the same
GB2318126A (en) Powder mixture and component made therefrom
JPH02153046A (en) High strength sintered alloy steel
JP3658465B2 (en) Iron-based sintered sliding member and manufacturing method thereof
JPH07103442B2 (en) Manufacturing method of high strength sintered alloy steel
Sokolowski et al. Diffusion-alloyed steels for high performance applications
CA1297705C (en) High impact strength powder metal part and method for making same

Legal Events

Date Code Title Description
AS Assignment

Owner name: MIBA SINTERMETALL AKTIENGESELLSCHAFT HAUPTSTRASSE

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:DROZDA, MANFRED;REEL/FRAME:004546/0514

Effective date: 19860401

Owner name: MIBA SINTERMETALL AKTIENGESELLSCHAFT,AUSTRIA

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:DROZDA, MANFRED;REEL/FRAME:004546/0514

Effective date: 19860401

Owner name: MIBA SINTERMETALL AKTIENGESELLSCHAFT, AUSTRIA

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:DROZDA, MANFRED;REEL/FRAME:004546/0514

Effective date: 19860401

STCF Information on status: patent grant

Free format text: PATENTED CASE

FPAY Fee payment

Year of fee payment: 4

FPAY Fee payment

Year of fee payment: 8

FEPP Fee payment procedure

Free format text: PAT HLDR NO LONGER CLAIMS SMALL ENT STAT AS INDIV INVENTOR (ORIGINAL EVENT CODE: LSM1); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY

FPAY Fee payment

Year of fee payment: 12